[GHC] #15843: Tuple sections can't be quoted

[GHC]

#15843: Tuple sections can't be quoted
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.1
           Keywords:  newcomer       |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 There are quite a few forms that are not supported in template haskell
 quotes. It seems that it would be at least a good warm up patch to add
 support for tuple sections which you can do simply by desugaring to a
 lambda and the normal tuple constructor.

 {{{
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TupleSections #-}
 module Foo where

 foo = [|| (,5) ||]
 }}}

 1. Modify `DsMeta.repE` to handle tuple sections. You can desugar `(,5) =>
 `\x -> (x, 5)`.
 2. Add the above test to the test suite.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15843>
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